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I have used LR since v1.0 with every single update in between and never had any major issues with LR including out-of-memory erros, upside-down red text on pics, adj. brush performance, now ahve run into this problem.

Thumbnails disappear just before the final high-quality pass. Scrolling out and into view make them redraw, just to disappear again together with the three dots. The neweste thread on the topic I was able to find was dated Sep, 2007: Grid thumbnails disappear after 1/2 second . It didn't solve my problem.

Some observations:

1. The problem only affects JPEG images, all other work fine.
   
2. Filmstrip is not affected, only grid view.
3. It's only when the thumbnail info includes the file extension, both in compact and extended mode. (see screenshot 1 and 2)
4. Metadata panel info is not shown for affected images. Keywording panel is fine.
5. Synchronize folder fails (does nothing) if the folder has at least one JPEG.
6. Exporting to a new catalog doesn't cure the problem.
7. Importing images into a fresh catalog does solve the problem.
8. Trashing prefs, TranslatedStrings.txt doesn't help.
   

Since the only thing that helps is a fresh catalog, my conclusion is catalog corruption. Unfortunately this is not an option for me: too many collections, VCs, flags and stacks lost. I need to cure the catalog. Binary, the catalog seems to be fine — it's been optimized and it passes the integrity test. Also I have opened it with 3rd party utilities (SQLiteSpy).